Hi Tony Right now, my little mirror is just inside the window sitting on my workbench. It is so sensitive to small vibrations that the sunspot quivers when I play music and when I walk across the room!
John John L. Carmichael Jr. Sundial Sculptures 925 E. Foothills Dr. Tucson Arizona 85718 USA Tel: 520-696-1709 Email: [EMAIL PROTECTED] Website: <http://www.sundialsculptures.com> ----- Original Message ----- From: "Tony Moss" <[EMAIL PROTECTED]> To: "Sundial Mail List" <[email protected]> Sent: Sunday, January 06, 2002 7:15 AM Subject: Re: Ceiling Sundials: Mirror Placement > John Carmichael contributed: > > > But something tells > >me that even this method could be riddled with errors. (i.e.. what if you > >give ZW2000 the wrong information because your measurement of the ceiling > >height was 2 mm. off? Or, will the glass cover on the floating mirror > >refract the sunspot?) > > I think you might also have trouble with ground vibrations revealed by > the optical lever. > > Hey John!...you've invented the world's first combination sundial and > seismometer! > > Perhaps a mirror on top of small gimbal-mounted pendulum would solve the > horizontality problem? With its centre defined by split hairs perhaps. > ;-) > > Tony Moss
